Quickstart
To reproduce the example shown in View AsciiDoc as HTML5 on the features page, do the following:
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Install the Asciidoctor Browser Extension using the Install page
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Create
ex-writing-zen.adocfrom the text below or download it.ex-writing-zen.adoc= AsciiDoc is Writing Zen Doc Writer <doc.writer@example.com> :icons: font _Zen_ in the *art* of writing `plain text` with https://asciidoc.org[AsciiDoc] TIP: Use https://asciidoctor.org[Asciidoctor] for the best AsciiDoc experience.footnote:[Not to mention the best looking output!] Then icon:comments[role=aqua] about it! == Sample section . item ** point ** point + NOTE: Auto numbered, auto indented . item [,ruby] ---- puts "Hello, World!" ----
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Open
ex-writing-zen.adocin your browser. You may either:- 
Open it by pressing Control+O
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Drag and drop
ex-writing-zen.adoconto your browser - 
Double-click
ex-writing-zen.adocFor double-click to work, you may need to change your computer settings to associate .adocwith your web browser. 
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Try different features with the following:
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Toggle the Asciidoctor Browser Extension activation by clicking its extension icon in the browser bar.
You’ll see the AsciiDoc behind the rendered HTML page.
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Change the Option: Theme/Stylesheet and reload.
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Change the Theme/Stylesheet using a query parameter. Add
stylesheet=githubto the end of the URL. - 
Edit the AsciiDoc file and save. Observe it update.
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Add
toc=leftto Option: Custom Attributes String, and reload. 
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Next steps
After the above, you may like to try the exercise in the Option: Diagrams Extension.